Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Can Existing Sensor-Based Technologies Predict Spring Wheat Yield and Protein

Authors
item Osborne, Shannon
item Gelderman, Ron - SOUTH DAKOTA STATE UNIV
item Beck, Dwayne - SOUTH DAKOTA STATE UNIV

Submitted to: Proceedings Great Plains Soil Fertility Conference
Publication Type: Proceedings
Publication Acceptance Date: January 12, 2006
Publication Date: March 7, 2006
Citation: Osborne, S.L., Gelderman, R., Beck, D. 2006. Can existing sensor-based technologies predict spring wheat yield and protein. Proceedings Great Plains Soil Fertility Conference, Denver CO, March 7-8, 2006.

Interpretive Summary: Sensor-based technologies for in-season application of nitrogen to winter wheat have been developed and are in use in the southern Great Plains. There is little information about the suitability of this technology for spring wheat production in the northern Great Plains. Field experiments were established in Brookings and Gettysburg, SD to evaluate the GreenSeeker Hand Held optical sensor (NTech Industries, Ukiah, CA) for measuring in-season nitrogen status on spring wheat. Sensor readings and plant biomass samples were collected at two separate growth stages (six leaves and boot). The sensor measures reflectance in the red and near infrared regions of the electromagnetic spectrum and calculates the normalized difference vegetation index (NDVI). The ability of the sensor readings to measure biomass, plant nitrogen uptake, and predict grain yield and protein for each sampling date was determined. In general, in-season plant biomass, plant nitrogen concentration, and grain yield increased with increasing nitrogen rate. Sensor readings (NDVI) collected at six leaves and boot showed a significant relationship with plant biomass, nitrogen uptake and grain yield, with readings collected at the later growth stage having higher correlations compared to the early sampling date. Initial results suggest that existing sensor-based variable nitrogen technology developed for winter wheat could be utilized in the northern Great Plains for estimating in-season nirogen need for spring wheat, but additional testing is necessary.

Technical Abstract: Sensor-based technologies for in-season application of nitrogen (N) to winter wheat (Triticum aestivum L.) have been developed and are in use in the southern Great Plains. There is little information about the suitability of this technology for spring wheat production in the northern Great Plains. Field experiments were established in Brookings and Gettysburg, SD to evaluate the GreenSeeker Hand Held optical sensor (NTech Industries, Ukiah, CA) for measuring in-season N status on spring wheat. Five N rates were applied pre-plant as ammonium nitrate. Sensor readings and plant biomass samples were collected at Feekes 6 and Feekes 10 growth stages. The sensor measures reflectance in the red and near infrared (NIR) regions of the electromagnetic spectrum and calculates the normalized difference vegetation index (NDVI). The ability of the sensor readings to measure biomass, plant N uptake, and predict grain yield and protein for each sampling date was determined. In general, in-season plant biomass, plant N concentration, and grain yield increased with increasing N rate. Sensor readings (NDVI) collected at Feekes 6 and Feekes 10 showed a significant relationship with plant biomass, N uptake and grain yield, with readings collected at the later growth stage having higher correlations compared to the early sampling date. Initial results suggest that existing sensor-based variable nitrogen technology developed for winter wheat could be utilized in the northern Great Plains for estimating in-season N need for spring wheat, but additional testing is necessary.

Last Modified: 12/22/2014
Footer Content Back to Top of Page